I'm 1) cheap, and 2) need to be sure my system is tuned right.
I was hoping someone would be able to refer me to a site (I have a Mac) I have already used the free trial of Tone Gen and now can't use it again.
The best way to obtain test tones is to make your own test CDs.
The best free tool for making test tone files is probably Audacity which runs on just about any kind of computer system, even Macs.
Just about every computer system has some kind of tool for burning audio CDs.
Now that we're talking about testing, remember that pure tones are generally very poor tools for doing acoustical testing. IOW any kind of a test that involves a SPL meter or a microphone and some kind of analysis program.
The problem with pure tones is that they are very susceptible to standing waves that create very narrrow band disturbances. You might measure so many dB at 1000 Hz, and something completely different at 1010 Hz,
The analytical software that many of us commonly use such as REW avoid this problem by not testing with pure steady sine waves. If you are working with a SPL meter the better choice of test signals would usually be warble tones or narrow bands of noise. You can generate these either with Audacity and some freebie plug ins that are easy to find on the web.